If you are still getting redirects to the maintenance page it is because your Internet Service provider hasn't or doesn't update their DNS server often enough. You need to get a decent ISP or write to them and tell them the problem.
If you don't get a satisfactory response then the get an new ISP or else just wait until they get their act together and have their DNS databases updated.
If you enter 67.201.16.181 into the url of your browser, it should take you to the PPRuNe home page. If it doesn't then your ISP is definitely second rate and should update their DNS more often.
If you know how to edit the "hosts" file on your 'puter then you can always add this to force it:
67.201.16.181 www.pprune.org
67.201.16.181 pprune.org
67.201.16.181 www.pprune.com
67.201.16.181 pprune.com
67.201.16.181 www.pprune.info
67.201.16.181 pprune.info
67.201.16.181 www.pprune.biz
67.201.16.181 pprune.biz
If you don't know how to edit the hosts file or have any idea what it is, then please don't ask.